The effect of state motorcycle licensing laws on motorcycle driver mortality rates.
D000063:Accidents, Traffic / Q000401:mortality*; D006801:Humans; D008004:Licensure / Q000331:legislation & jurisprudence* / Q000706:statistics & numerical data; D009049:Motorcycles / Q000331:legislation & jurisprudence* / Q000706:statistics & numerical data; D011640:Public Policy; D012044:Regression Analysis; D013219:State Government; D014481:United States / Q000453:epidemiology